Document how to configure FFI logging

[JP-Ellis]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Description

Improve the documentation as to how logging can be configured for the FFI. Specifically, it should:

1. Direct users to the pact_ffi.log_to_stderr function

2. Advise that the FFI logging can only be initialised once, and as such, is probably best placed in a fixture within conftest.py:

   import pytest
   import pact_ffi
   
   @pytest.fixture(autouse=True, scope="session")
   def pact_logging():
       pact_ffi.log_to_stderr("INFO")

3. Advise that more advanced configuration can be set up (such as logging to an internal buffer and retrieving logs on demand).

Motivation

While the Python code uses the standard library logging, the underlying FFI cannot interface with that. This is why there's a need to configure logging first.

Have you tried building it?

No response

Self-service

• I'd be willing to contribute this feature to Pact Python myself.